@article{35744, author = {{Biehler, Rolf and Weigand, Hans-Georg}}, journal = {{mathematik lehren}}, number = {{228}}, pages = {{2–5}}, publisher = {{Friedrich Verlag}}, title = {{{3D-Geometrie–virtuell und real}}}, volume = {{2021}}, year = {{2021}}, } @article{35761, author = {{Höper, Lukas and Malin, Leah and Biehler, Rolf}}, journal = {{mathematik lehren}}, number = {{228}}, pages = {{19–22}}, publisher = {{Friedrich Verlag}}, title = {{{Schatten von 3D-Objekten: Modellierung mit GeoGebra 3D und Anwendungen in der Computergrafik}}}, volume = {{2021}}, year = {{2021}}, } @article{35763, author = {{Hüsing, Sven and Weiser, Niklas and Biehler, Rolf}}, journal = {{mathematik lehren}}, number = {{228}}, pages = {{23–27}}, publisher = {{Friedrich Verlag}}, title = {{{Faszination 3D-Film: Entwicklung einer 3D-Konstruktion}}}, volume = {{2021}}, year = {{2021}}, } @article{53874, author = {{Rastegar, Mehdi and Tavana, Madjid and Meraj, Afshin and Mina, Hassan}}, issn = {{0264-410X}}, journal = {{Vaccine}}, number = {{3}}, pages = {{495--504}}, publisher = {{Elsevier BV}}, title = {{{An inventory-location optimization model for equitable influenza vaccine distribution in developing countries during the COVID-19 pandemic}}}, doi = {{10.1016/j.vaccine.2020.12.022}}, volume = {{39}}, year = {{2021}}, } @article{53880, author = {{Zare, Habib and Kamali Saraji, Mahyar and Tavana, Madjid and Streimikiene, Dalia and Cavallaro, Fausto}}, issn = {{2071-1050}}, journal = {{Sustainability}}, number = {{22}}, publisher = {{MDPI AG}}, title = {{{An Integrated Fuzzy Goal Programming—Theory of Constraints Model for Production Planning and Optimization}}}, doi = {{10.3390/su132212728}}, volume = {{13}}, year = {{2021}}, } @article{53875, author = {{Gheisariha, Elmira and Tavana, Madjid and Jolai, Fariborz and Rabiee, Meysam}}, issn = {{0378-4754}}, journal = {{Mathematics and Computers in Simulation}}, pages = {{152--178}}, publisher = {{Elsevier BV}}, title = {{{A simulation–optimization model for solving flexible flow shop scheduling problems with rework and transportation}}}, doi = {{10.1016/j.matcom.2020.08.019}}, volume = {{180}}, year = {{2021}}, } @article{27508, abstract = {{To analyze the influence of suspension kinematics on tire wear, detailed simulation models are required. In this study, a non-linear, flexible multibody model of a rear axle system is built up in the simulation software MSC Adams/View. The physical model comprises the suspension kinematics, compliance, and dynamics as well as the non-linear behavior of the tire using the FTire model. FTire is chosen because it has a separate tire tread model to compute the contact pressure and friction force distribution in the tire contact patch. To build up the simulation model, a large amount of data is needed. Bushings, spring, and damper characteristics are modeled based on measurements. For the structural components (e.g., control arms), reverse engineering techniques are used. The components are 3D-scanned, reworked, and included as a modal reduced finite element (FE)-model using component mode synthesis by Craig–Bampton. Finally, the suspension model is validated by comparing the simulated kinematic and compliance characteristics to experimental results. To investigate the interaction of suspension kinematics and tire wear, straight line driving events, such as acceleration, driving with constant velocity, and deceleration, are simulated with different setups of wheel suspension kinematics. The influence of the setups on the resulting friction work between tire and road is examined, and an exemplarily calculation of tire wear based on a validated FTire tire model is carried out. The results demonstrate, on the one hand, that the chosen concept of elasto-kinematic axle leads to a relatively good match with experimental results and, on the other hand, that there are significant possibilities to reduce tire wear by adjusting the suspension kinematics.}}, author = {{Schütte, Jan and Sextro, Walter}}, issn = {{2624-8921}}, journal = {{Vehicles}}, pages = {{233--256}}, title = {{{Tire Wear Reduction Based on an Extended Multibody Rear Axle Model}}}, doi = {{10.3390/vehicles3020015}}, year = {{2021}}, } @article{45844, abstract = {{Abstract Abductive reasoning is a non-monotonic formalism stemming from the work of Peirce. It describes the process of deriving the most plausible explanations of known facts. Considering the positive version, asking for sets of variables as explanations, we study, besides the problem of wether there exists a set of explanations, two explanation size limited variants of this reasoning problem (less than or equal to, and equal to a given size bound). In this paper, we present a thorough two-dimensional classification of these problems: the first dimension is regarding the parameterized complexity under a wealth of different parameterizations, and the second dimension spans through all possible Boolean fragments of these problems in Schaefer’s constraint satisfaction framework with co-clones (T. J. Schaefer. The complexity of satisfiability problems. In Proceedings of the 10th Annual ACM Symposium on Theory of Computing, May 1–3, 1978, San Diego, California, USA, R.J. Lipton, W.A. Burkhard, W.J. Savitch, E.P. Friedman, A.V. Aho eds, pp. 216–226. ACM, 1978). Thereby, we almost complete the parameterized complexity classification program initiated by Fellows et al. (The parameterized complexity of abduction. In Proceedings of the Twenty-Sixth AAAI Conference on Articial Intelligence, July 22–26, 2012, Toronto, Ontario, Canada, J. Homann, B. Selman eds. AAAI Press, 2012), partially building on the results by Nordh and Zanuttini (What makes propositional abduction tractable. Artificial Intelligence, 172, 1245–1284, 2008). In this process, we outline a fine-grained analysis of the inherent parameterized intractability of these problems and pinpoint their FPT parts. As the standard algebraic approach is not applicable to our problems, we develop an alternative method that makes the algebraic tools partially available again.}}, author = {{Mahmood, Yasir and Meier, Arne and Schmidt, Johannes}}, issn = {{0955-792X}}, journal = {{Journal of Logic and Computation}}, keywords = {{Logic, Hardware and Architecture, Arts and Humanities (miscellaneous), Software, Theoretical Computer Science}}, number = {{1}}, pages = {{266--296}}, publisher = {{Oxford University Press (OUP)}}, title = {{{Parameterized complexity of abduction in Schaefer’s framework}}}, doi = {{10.1093/logcom/exaa079}}, volume = {{31}}, year = {{2021}}, } @inproceedings{46315, abstract = {{We propose a novel method for automated algorithm selection in the domain of single-objective continuous black-box optimization. In contrast to existing methods, we use convolutional neural networks as the selection apparatus which bases its decision on a so-called ‘fitness map’. This fitness map is a 2D representation of a two dimensional search space where different gray scales indicate the quality of found solutions in certain areas. Our devised approach uses a modular CMA-ES framework which offers the option to create the conventional CMA-ES, CMA-ES with the alternate step-size adaptation and many other variants proposed over the years. In total, 4 608 different configurations are possible where most configurations are of complementary nature. In this proof-of-concept work, we consider a subset of 32 possible configurations. The developed method is evaluated against an excerpt of BBOB functions and its performance is compared against baselines that are commonly used in automated algorithm selection - the best standalone algorithm (configuration) and the best obtainable sequence of configurations. While the results indicate that the use of the fitness map is not superior on every benchmark problem, it indubitably shows its merit on more hard-to-solve problems. This offers a promising perspective for generalizing to other types of optimization problems and problem domains.}}, author = {{Prager, Raphael Patrick and Seiler, Moritz and Trautmann, Heike and Kerschke, Pascal}}, booktitle = {{2021 IEEE Symposium Series on Computational Intelligence (SSCI)}}, pages = {{1--8}}, title = {{{Towards Feature-Free Automated Algorithm Selection for Single-Objective Continuous Black-Box Optimization}}}, doi = {{10.1109/SSCI50451.2021.9660174}}, year = {{2021}}, } @inproceedings{46313, abstract = {{Classic automated algorithm selection (AS) for (combinatorial) optimization problems heavily relies on so-called instance features, i.e., numerical characteristics of the problem at hand ideally extracted with computationally low-demanding routines. For the traveling salesperson problem (TSP) a plethora of features have been suggested. Most of these features are, if at all, only normalized imprecisely raising the issue of feature values being strongly affected by the instance size. Such artifacts may have detrimental effects on algorithm selection models. We propose a normalization for two feature groups which stood out in multiple AS studies on the TSP: (a) features based on a minimum spanning tree (MST) and (b) a k-nearest neighbor graph (NNG) transformation of the input instance. To this end we theoretically derive minimum and maximum values for properties of MSTs and k-NNGs of Euclidean graphs. We analyze the differences in feature space between normalized versions of these features and their unnormalized counterparts. Our empirical investigations on various TSP benchmark sets point out that the feature scaling succeeds in eliminating the effect of the instance size. Eventually, a proof-of-concept AS-study shows promising results: models trained with normalized features tend to outperform those trained with the respective vanilla features.}}, author = {{Heins, Jonathan and Bossek, Jakob and Pohl, Janina and Seiler, Moritz and Trautmann, Heike and Kerschke, Pascal}}, booktitle = {{Proceedings of the 16$^th$ ACM/SIGEVO Conference on Foundations of genetic Algorithms (FOGA XVI)}}, editor = {{Computing Machinery Association, for}}, pages = {{1–15}}, publisher = {{Association for Computing Machinery}}, title = {{{On the Potential of Normalized TSP Features for Automated Algorithm Selection}}}, doi = {{10.1145/3450218.3477308}}, year = {{2021}}, } @inproceedings{36845, author = {{Kruse, Anne and Ott, Manuel and Risse, Lena and Koch, Rainer}}, location = {{Berlin}}, publisher = {{Deutscher Verband für Materialforschung und -prüfung e.V.}}, title = {{{3D-Druck - Eine Technologie als Schlüssel zur Steigerung der Teilhabe}}}, doi = {{10.48447/Add-2021-016}}, year = {{2021}}, } @article{40512, author = {{Hüsing, Sven and Weiser, Niklas and Biehler, Rolf}}, journal = {{mathematik lehren}}, number = {{228}}, pages = {{23–27}}, publisher = {{Friedrich Verlag}}, title = {{{Faszination 3D-Film: Entwicklung einer 3D-Konstruktion}}}, volume = {{2021}}, year = {{2021}}, } @article{41011, abstract = {{The controlled assembly of well-defined planar nanoclusters from molecular precursors is synthetically challenging and often plagued by the predominant formation of 3D-structures and nanoparticles. Herein, we report planar iron hydride nanoclusters from reactions of main group element hydrides with iron(II) bis(hexamethyldisilazide). The structures and properties of isolated Fe4, Fe6, and Fe7 nanoplatelets and calculated intermediates enable an unprecedented insight into the underlying building principle and growth mechanism of iron clusters, metal monolayers, and nanoparticles.}}, author = {{Chakraborty, Uttam and Bügel, Patrick and Fritsch, Lorena and Weigend, Florian and Bauer, Matthias and Jacobi von Wangelin, Axel}}, issn = {{2191-1363}}, journal = {{ChemistryOpen}}, keywords = {{General Chemistry}}, number = {{2}}, pages = {{265--271}}, publisher = {{Wiley}}, title = {{{Planar Iron Hydride Nanoclusters: Combined Spectroscopic and Theoretical Insights into Structures and Building Principles}}}, doi = {{10.1002/open.202000307}}, volume = {{10}}, year = {{2021}}, } @article{30119, abstract = {{Abstract Background Subjective Memory Complaints (SMC) in elderly people due to preclinical Alzheimer’s Disease may be associated with dysregulation of the Kynurenine Pathway (KP), with an increase in neurotoxic metabolites that affect cognition. Golf is a challenging sport with high demands on motor, sensory, and cognitive abilities, which might bear the potential to attenuate the pathological changes of preclinical AD. This trial investigated the feasibility of learning to play golf for elderly with cognitive problems and its effects on cognitive functions and the KP. Methods In a 22-week single-blinded randomized controlled trial, elderly people with SMC were allocated to the golf (n = 25, 180 min training/week) or control group (n = 21). Primary outcomes were feasibility (golf exam, adherence, adverse events) and general cognitive function (Alzheimer’s Disease Assessment Scale). Secondary outcomes include specific cognitive functions (Response Inhibition, Corsi Block Tapping Test, Trail Making Test), KP metabolites and physical performance (6-Minute-Walk-Test). Baseline-adjusted Analysis-of-Covariance was conducted for each outcome. Results 42 participants were analyzed. All participants that underwent the golf exam after the intervention passed it (20/23). Attendance rate of the golf intervention was 75 %. No adverse events or drop-outs related to the intervention occurred. A significant time*group interaction (p = 0.012, F = 7.050, Cohen’s d = 0.89) was found for correct responses on the Response Inhibition task, but not for ADAS-Cog. Moreover, a significant time*group interaction for Quinolinic acid to Tryptophan ratios (p = 0.022, F = 5.769, Cohen’s d = 0.84) in favor of the golf group was observed. An uncorrected negative correlation between attendance rate and delta Quinolinic acid to Kynurenic acid ratios in the golf group (p = 0.039, r=-0.443) was found as well. Conclusions The findings indicate that learning golf is feasible and safe for elderly people with cognitive problems. Preliminary results suggest positive effects on attention and the KP. To explore the whole potential of golfing and its effect on cognitive decline, a larger cohort should be studied over a longer period with higher cardiovascular demands. Trial registration The trial was retrospectively registered (2nd July 2018) at the German Clinical Trials Register (DRKS00014921). }}, author = {{Stroehlein, Julia K. and Vieluf, Solveig and Zimmer, Philipp and Schenk, Alexander and Oberste, Max and Gölz, Christian Johannes and van den Bongard, Franziska and Reinsberger, Claus}}, issn = {{1471-2377}}, journal = {{BMC Neurology}}, keywords = {{Clinical Neurology, General Medicine}}, number = {{1}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Learning to play golf for elderly people with subjective memory complaints: feasibility of a single‐blinded randomized pilot trial}}}, doi = {{10.1186/s12883-021-02186-9}}, volume = {{21}}, year = {{2021}}, } @article{41818, author = {{Hense, Dominik and Büngeler, Anne and Kollmann, Fabian and Hanke, Marcel and Orive, Alejandro and Keller, Adrian and Grundmeier, Guido and Huber, Klaus and Strube, Oliver I.}}, issn = {{1525-7797}}, journal = {{Biomacromolecules}}, keywords = {{Materials Chemistry, Polymers and Plastics, Biomaterials, Bioengineering}}, number = {{10}}, pages = {{4084--4094}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Self-Assembled Fibrinogen Hydro- and Aerogels with Fibrin-like 3D Structures}}}, doi = {{10.1021/acs.biomac.1c00489}}, volume = {{22}}, year = {{2021}}, } @article{41909, abstract = {{The continuous development of medical methods in recent decades has achieved measurable improvement. The interdisciplinary cooperation of engineers and physicians is a forward-looking component of this development. However, this cooperation also results in new interfaces on the communication and software level, which must be defined by implementing a systematic workflow. In this paper, the step-by-step implementation of engineering methods into the surgical workflow is shown. The focus is on the basic requirements and the necessary exchange of information. Additively manufactured models for preoperative elucidation of the patient are used as a psychological added value to increase the transparency of the surgical procedure. In addition, the models serve to train young surgeons and provide the opportunity to plan advanced surgical techniques.}}, author = {{Risse, Lena and Kullmer, Gunter}}, issn = {{2059-4755}}, journal = {{Journal of 3D Printing in Medicine}}, keywords = {{General Medicine}}, number = {{2}}, pages = {{111--121}}, publisher = {{Future Medicine Ltd}}, title = {{{Application of engineering methods in the planning process of surgical treatments}}}, doi = {{10.2217/3dp-2020-0020}}, volume = {{5}}, year = {{2021}}, } @inproceedings{39401, author = {{Lange, Sven and Hedayat, Christian and Kuhn, Harald and Hilleringmann, Ulrich}}, booktitle = {{2021 Smart Systems Integration (SSI)}}, publisher = {{IEEE}}, title = {{{Adaptation and Optimization of Planar Coils for a More Accurate and Far-Reaching Magnetic Field-Based Localization in the Near Field}}}, doi = {{10.1109/ssi52265.2021.9466958}}, year = {{2021}}, } @article{21946, abstract = {{Lithium niobate (LiNbO3), a material frequently used in optical applications, hosts different kinds of polarons that significantly affect many of its physical properties. In this study, a variety of electron polarons, namely free, bound, and bipolarons, are analyzed using first-principles calculations. We perform a full structural optimization based on density-functional theory for selected intrinsic defects with special attention to the role of symmetry-breaking distortions that lower the total energy. The cations hosting the various polarons relax to a different degree, with a larger relaxation corresponding to a larger gap between the defect level and the conduction-band edge. The projected density of states reveals that the polaron states are formerly empty Nb 4d states lowered into the band gap. Optical absorption spectra are derived within the independent-particle approximation, corrected by the GW approximation that yields a wider band gap and by including excitonic effects within the Bethe-Salpeter equation. Comparing the calculated spectra with the density of states, we find that the defect peak observed in the optical absorption stems from transitions between the defect level and a continuum of empty Nb 4d states. Signatures of polarons are further analyzed in the reflectivity and other experimentally measurable optical coefficients.}}, author = {{Schmidt, Falko and Kozub, Agnieszka L. and Gerstmann, Uwe and Schmidt, Wolf Gero and Schindlmayr, Arno}}, issn = {{2073-4352}}, journal = {{Crystals}}, pages = {{542}}, publisher = {{MDPI}}, title = {{{Electron polarons in lithium niobate: Charge localization, lattice deformation, and optical response}}}, doi = {{10.3390/cryst11050542}}, volume = {{11}}, year = {{2021}}, } @article{32434, abstract = {{Whereas initial findings have already identified cortical patterns accompanying proprioceptive deficiencies in patients after anterior cruciate ligament reconstruction (ACLR), little is known about compensatory sensorimotor mechanisms for re-establishing postural control. Therefore, the aim of the present study was to explore leg dependent patterns of cortical contributions to postural control in patients 6 weeks following ACLR. A total of 12 patients after ACLR (25.1 ± 3.2 years, 178.1 ± 9.7 cm, 77.5 ± 14.4 kg) and another 12 gender, age, and activity matched healthy controls participated in this study. All subjects performed 10 × 30 s. single leg stances on each leg, equipped with 64-channel mobile electroencephalography (EEG). Postural stability was quantified by area of sway and sway velocity. Estimations of the weighted phase lag index were conducted as a cortical measure of functional connectivity. The findings showed significant group × leg interactions for increased functional connectivity in the anterior cruciate ligament (ACL) injured leg, predominantly including fronto−parietal [F(1, 22) = 8.41, p ≤ 0.008, η2 = 0.28], fronto−occipital [F(1, 22) = 4.43, p ≤ 0.047, η2 = 0.17], parieto−motor [F(1, 22) = 10.30, p ≤ 0.004, η2 = 0.32], occipito−motor [F(1, 22) = 5.21, p ≤ 0.032, η2 = 0.19], and occipito−parietal [F(1, 22) = 4.60, p ≤ 0.043, η2 = 0.17] intra−hemispherical connections in the contralateral hemisphere and occipito−motor [F(1, 22) = 7.33, p ≤ 0.013, η2 = 0.25] on the ipsilateral hemisphere to the injured leg. Higher functional connectivity in patients after ACLR, attained by increased emphasis of functional connections incorporating the somatosensory and visual areas, may serve as a compensatory mechanism to control postural stability of the injured leg in the early phase of rehabilitation. These preliminary results may help to develop new neurophysiological assessments for detecting functional deficiencies after ACLR in the future.}}, author = {{Lehmann, Tim and Büchel, Daniel and Mouton, Caroline and Gokeler, Alli and Seil, Romain and Baumeister, Jochen}}, issn = {{1662-5161}}, journal = {{Frontiers in Human Neuroscience}}, keywords = {{Behavioral Neuroscience, Biological Psychiatry, Psychiatry and Mental health, Neurology, Neuropsychology and Physiological Psychology}}, publisher = {{Frontiers Media SA}}, title = {{{Functional Cortical Connectivity Related to Postural Control in Patients Six Weeks After Anterior Cruciate Ligament Reconstruction}}}, doi = {{10.3389/fnhum.2021.655116}}, volume = {{15}}, year = {{2021}}, } @inbook{22766, author = {{Dahms, Frederik and Homberg, Werner}}, booktitle = {{Forming the Future}}, issn = {{2367-1181}}, location = {{Ohio, USA, VIRTUAL EVENT}}, pages = {{2249--2259}}, publisher = {{Springer, Cham}}, title = {{{Investigations and Improvements in 3D-DIC Optical Residual Stress Analysis—A New Temperature Compensation Method}}}, doi = {{10.1007/978-3-030-75381-8_189}}, year = {{2021}}, }